shylock: A ruthless moneylender; a loan shark.
https://www.thefreedictionary.com/shylocking

"Loan sharking is the practice of lending money to desperate people at extremely high and illegal rates of interest. Loan sharks, or shylocks, make a big profit from people who can't get loans from legitimate sources, such as banks or other lending institutions."
http://ezinearticles.com/?Loan-Sharks---What-You-Need-to-Kno...

(f) "Loan shark" or "shylock" means any person as defined herein who lends money unlawfully
https://law.justia.com/codes/florida/2007/TitleXXXIX/chapter...

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Note added at 15 Min. (2019-03-20 12:53:46 GMT)
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"gioco d'azzardo e strozzinaggio" "mafia"
https://www.google.com/search?client=firefox-b-d&q="gioco d'...

"gioco d'azzardo e usura" "mafia" https://www.google.com/search?client=firefox-b-d&q="gioco d'...

"Ma il dizionario di Cosa Nostra comprende anche sprazzi di elegantissimo culturale, come dimostra ampiamente il termine ''Shylocking'', prestare soldi ad usura, che viene nientemeno che da ''Il mercante di Venezia'' di William Shakespeare, sintomo chiaro di insospettate buone letture." http://www1.adnkronos.com/Archivio/AdnAgenzia/1992/03/13/Est...

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Note added at 24 Min. (2019-03-20 13:02:58 GMT)
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**prestito a usura**

"Loansharking is the practice of lending money at exorbitant interest rates, especially when financed and supported by an organized crime network. Loansharking usually involves threatening extortion to get repayment. "
https://definitions.uslegal.com/l/loansharking/

loansharking (illegal moneylending): strozzinaggio, prestito a usura
http://www.wordreference.com/enit/loansharking